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Delta U represents the internal energy of a system, whether that is in the form of heat or work while Delta S represent the variability of different states that a molecule can be in (relating to degeneracy). Furthermore, Delta U uses strictly Jules as units while Delta S uses J/degree K.
For entropy, delta S is basically a measure of the change in order/disorder of the reaction. Increasing order gives us a negative delta S value, and decreasing order gives a positive delta S value. ΔU is the change in internal energy U of the system.
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